In 1974, 3M scientist Art Fry came up with a clever invention. He thought if he could apply an adhesive (dreamed up by colleague Spencer Silver several years earlier) to the back of a piece of paper, he could create the perfect bookmark, one that kept place in his church hymnal. He called it the Post-It Note.

In 1974, 3M scientist Art Fry came up with a clever invention. He thought if he could apply an adhesive (dreamed up by colleague Spencer Silver several years earlier) to the back of a piece of paper, he could create the perfect bookmark, one that kept place in his church hymnal. He called it the Post-It Note.